I saw that too, the Note Tab behavior was chaotic, but for me it disappeared with the latest version 2.7.8. (Windows 10).
Is there any warning or error in the console about the Note Tab plugin? How to enable debugging | Joplin
I have noticed this when trying to close tabs, but it never locks up completely. I just installed 2.7.8 and I'll see if it is still happening.
I noticed after upgrading that now my custom css for the notebook and notes column is now no longer working. I know that this is a risk for the custom css. But I wonder if it is worth it to mention that class names or something has changed so folks may need to update their css?
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No, no error or warning in the console. I have so far not seen it lock up on 2.7.8 
I am seeing this warning for the quicklinks plugin
Logger.ts:219 13:56:23: BackOffHandler: Plugin com.whatever.quick-links: Applying a backoff of 8 seconds due to frequent plugin API calls. Consider reducing the number of calls, caching the data, or requesting more data per call. API call was: joplin.data.get ['folders'] {fields: Array(2), page: 1} [Wait count: 1]
Huh, this is interesting. The only thing my plugin does with folders is getting the full list list once a minute or so.
@laurent now that Joplin is throttling, have you considered removing pagination, at least for plugins? Otherwise, if I want to get all notes/folders/tags/etc, and there are lots of them, I have to throttle the call for each subsequent page, and so getting the full list may take some time.
If I'm not mistaken throttling has been disabled now, just something to consider before enabling it again.
).
Ah, thanks Amanda. Lost a 0 there.
Fixed in the new version that I've just published. Should be available shortly.
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A new update is available with the changes below.
If you use custom notebook icons make sure you also install the latest mobile pre-release.
- New: Add additional time format HH.mm (#6086 by @vincentjocodes)
- New: Add support for custom notebook icons (#6110)
- Improved: Fixed sync scroll issue (#6059) (#5808 by Caleb John)
- Improved: Make heading 4, 5 and 6 styling more consistent (fca5875)
- Improved: Update Mermaid 8.13.5 -> 8.13.9 and Katex dependencies (#6039 by Helmut K. C. Tessarek)
- Fixed: Add "Other applications" import menu item (#6118) (#6108 by Helmut K. C. Tessarek)
- Fixed: Global search focuses text in notes so that edits overwrite highlighted text (#6040) (#6035 by Caleb John)
- Fixed: Login field was sometimes disabled on Sync Wizard dialog (#6075)
- Fixed: Scroll position is not remembered (regression) (#6043) (#6042 by Kenichi Kobayashi)
- Fixed: Shared resource was not encrypted with correct encryption key (#6092)
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Hi, just to be sure to understand, what is the risk if I use notebook icon and if I use the 2.6 mobile app (I'm on iPhone and I don't know yet how to compile Joplin and dl it on my iPhone) ? Thanks
Because the older app will not understand the new icon format it might crash, so it's better to have both 2.7 versions.
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Just released another version to make changing custom icons a bit easier (instead of showing an error if the image is too large, it resizes it automatically).
If there's no problem with this release I will make it an official release.
- Improved: Resize custom icon down to 256px when it is too large (064891d)
- Updated translations
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well FWIW, I have accidentally downloaded a v2.7 Portable and assigned icons without thinking about it; and both my android and v2.6 win desktop apps still work. Phew. 
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I noticed that I now see this same warning dozens of times for the note overview plugin on Joplin 2.7.12 (prod, darwin). It was also happening on the previous release (I just upgraded to see if that was causing the issue). FYI @JackGruber
08:06:38: BackOffHandler: Plugin io.github.jackgruber.note-overview: Applying a backoff of 8 seconds due to frequent plugin API calls. Consider reducing the number of calls, caching the data, or requesting more data per call. API call was: joplin.data.get Array(3) Object [Wait count: 1]
One problem you might have is that when you upgrade your other apps to 2.7 and sync, you won't get the notebook custom icons. To solve this, you can just open the app that has the custom icons, then click "Edit" on each notebook and then "Save" (without making any change). This will force a sync and you should get back the icons.
In the latest version I've left the warning messages, so that we can investigate possible performance issues, but disabled the actual timeout. So in practice all plugins, even those printing these warnings, should work as normal.
I dunno. The icons immediately worked on both windows v2.6 and android.
To my surprise it indeed works without crash or having to resync. I have no idea how, but I'm not going to complain if something that shouldn't work does.
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You're That Good! 
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Using 2.7.12 Appimage on Linux 20.3. Attempting to print crashes Jopin - it exits with no error message. FYI same thing happens with Typora and MarkText but every other app prints fine for me.