Restart Thunderbird with add-ons disabled (Thunderbird Safe Mode).

On the Help menu, click on "Restart with Add-ons Disabled". If Thunderbird works like normal, there is an Add-on or Theme interfering with normal operations. You will need to re-enable add-ons one at a time until you locate the offender.

If you do determine it to be an add-on, we would appreciate you posting the name of one that caused the issue.

Tried that, still had problem. Going through now and removing editing filters - apparently the update doesn't want to play sounds.

Once I removed sounds, filters seem to be working.

Thanks for your reposnse

Still wondering why sounds won't work.

There is an issue with non default sound files. I do not really understand it, but it has a lot to do with how many bits things are and the file size. But that is only my limited understanding.

Last I saw in the bug the Mozilla core people had joined in as it affects Firefox as well. I guess your filter are a side issue. And a small one as most of the sound issued manifest as a crash. Not good at all.

Normally I would post a link to the bug so you could follow along, but this one has been declared a security bug so access is restricted.

perhaps a downgrade might be in order until the bug is fixed, which on current appearances may not be more than a few weeks.

I just tried to add a sound to a filter, no options to do so.

Am I to assume you are using filtaqilla which is only certified to version 45. The Author Kent James has retired as I understand it and development has been taken over by Axel Grude.

He has a pre release version of the add-on here https://www.mozdev.org/bugs/show_bug.cgi?id=26599

If the pre release version still shows the issue I suggest you drop a note to Axel. If it comes to that mention this bug, it may well be relevant to him and I think he has the relevant access to see it. https://bugzilla.mozilla.org/show_bug.cgi?id=1482659