Thank you for the crash report.  It appears to be due to a bug in Apple's driver for the AMD Radeon GPU on macOS 26.5.1 (Tahoe).  We've had one or two other users report crashes like this in the last year or so and could never reproduce because our Macs here are all built on Apple Silicon and therefore don't use the AMD Radeon GPU which is used in Intel Macs.

Since it would take some time to develop a workaround and even longer, maybe forever, for Apple to ship a fix for this bug, and since Trouble Zipper will not gather your multiple browser profile data anyhow, just send us your BookMacster data by doing this instead…

• Activate Finder
• Hold down the 'option' key on your keyboard.
• Click in the main menu: Go > Library.  A window will open.
• In that window, navigate into folder "Application Support".
• Perform a secondary click (right click, control click) on the folder named "BookMacster".
• In the contextual menu which appears, click "Compress".  A file named "BookMacster.zip" will appear.
• Drag BookMacster.zip to your Desktop.
• Attach it in an email to us.  If it is too big to email (more than 10-20 MB), click this link and drop it into our Dropbox instead:
https://www.dropbox.com/request/q0AIbDugE5xd6H5Mu0Y5
• Trash the BookMacster.zip file.

I was wondering if maybe, since you have multiple profiles, Chrome was requiring that in order to export to Profile X, you must have at least one Chrome browser window open in Profile X.  But, to my surprise, that is not the case.  Provided that I have a Chrome browser window open in any profile, I can export from BookMacster to all profiles.

If I have zero browser windows open, then exporting to any profile fails, indicating that the Chromium team has shown no interest in fixing this after several years 

So then I set up a test of your configuration, 3 profiles in Chrome and 2 profiles in Comet, added all 5 profiles as Clients in BookMacster, then did an Export to All several times and it worked fine.  I have a typical Collection of 427 folders and 1325 bookmarks.

What is the failure rate?  I mean, how many times would I need to try an export before likely seeing an error 651507?

I suppose you could send us your data and I could try to reproduce the problem with your Collection.  To do that,

• Run BookMacster.
• Click in the menu: Help ▸ Trouble Zipper.
• For Question X (Extra Extension Tests), answer "No"
• For Question B (Bookmarks and Documents), answer "Include Bookmarks and Documents"
• In the list which appears, choose "Google Chrome", and "Comet" if you see it in the menu.  I forgot if we've added support for Comet in Trouble Zipper yet.  But Trouble Zipper only picks up the first profile anyhow.  The important thing is that I get your BookMacster Collection, which is a "Document" so it should be included.
• In the "Please explain..." section, leave it blank unless you have more information to tell.
• Send me the resulting .zip via MailDrop, Dropbox or whatever, as instructed.

OK, so the problem is that these manual import or export attempts sometimes fail, indicating an error?  What is the error number?

Hello again, Andy.

When you refer to trouble syncing, which of the following do you mean

• Manually (In BookMacster, manually click in the menu: File > Import… or [i]Export...)
• Automatically (Change bookmark(s) in a browser, expecting that syncing the change to other browsers will occur automatically.)

Keeping thoise browser windows open will be tedious and fragile for you.  It is sad that this bug (not messaging with other apps unless a browser window is open) was introduced into Chrome a year or two ago and the Chrome team has acknowledged it but no apparent action for over a year.  Clicking on that link in the previous sentence and adding comments might help.

Hello, Andy.

Thank you for contacting us.

I just realized that syncing different personas (profiles) in the same browser is going to be challenging, because recent changes in Chrome caused us to disable importing/exporting while the browser is not running in a given profile, and also a recent bug in Chrome, which then spread to the other Chromium-style browsers, that causes syncing with a given profile to fail if there is no window open in that profile.  Failures will result in very annoying error notifications.

I think that, for any browser in which you are syncing to or more profiles, you may need leave at least one window open in each profile/persona.  (Minimized to the Dock counts as "open".)

Please reply and tell me how many profiles in what browsers you want synced, and which one is your "Reference" persona.  Also tell me what you think about leaving browsers running and windows open.  I'll be able to respond more specifically.

Normally, for syncing among the internal bookmarks of web browsers, you do not use New  bookmark is landed from browser.  The word landed in this context means that you manually sent the bookmark directly from the browser to BookMacster using BookMacster's Status Item, Dock menu or global keyboard shortcut.

Actually, you should really consider doing that, using BookMacster directly as we call it, instead of adding bookmarks to browsers' built-in bookmarks and relying on BookMacster to sync.  Syncing is always more problematic, and with different profiles in the same browser nowadays, even if there is a way to make it work, it is going to be really fragile.  This is where you would use New  bookmark is landed from browser.

Again, all the trouble comes from persona/profiles in the same browser.  If you'd only have one persona/profile in each browser, appropriately setting one Import and many Export checkboxes as you discussed would work.