Hi,<br><br>I am aware that this might not be an appropriate topic for this list, but you never know.<br><br><div itemprop="text"><p>I am running TB on Fedora 23. Have been using TB for years without problems.
Suddenly when I launched TB the little wheel kept spinning and still does.&nbsp; I can't send or receive email. 
Nothing has changed in my account settings nor was there an update of TB. Ik can still handle email via webmail on this account.
</p><p>This is a message in the error-console: 
Timestamp: 05/31/2016 02:57:52 PM
Warning: Unknown property 'grid-auto-columns'.  Declaration dropped.
Source File: resource://gre-resources/ua.css
Line: 175, Column: 19
Source Code:
</p><pre> grid-auto-columns: inherit;
</pre>
<p>I don't know if this explains the locking up.
I tried to remove and reinstall TB, but the problem remains. I asked this question at the Mozilla support forum, but this does not seem to be a useful forum.<br></p><p>I don't know how to solve this problem. Does anyone have a clue?
Thanks in advance,
</p><p>Peter
</p></div><br>