Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

I downloaded 38.2.0 but it gets hung up "(Not Responding)" downloading emails in "important". Reinstalling did not fix Error message Apphang B1.

more options

I can't use Thunderbird 38.2.0 on my PC because it continually is "not responding". Windows cannot resolve the problem. The problem code is AppHang B1. When I close the program and re-open it, I receive messages, but once it starts downloading messages in "important" it freezes up.

I can't use Thunderbird 38.2.0 on my PC because it continually is "not responding". Windows cannot resolve the problem. The problem code is AppHang B1. When I close the program and re-open it, I receive messages, but once it starts downloading messages in "important" it freezes up.

Modified by Wayne Mery

All Replies (3)

more options

Is "important" a folder you created, or a gmail folder?

more options

mariannefitzgerald said

I can't use Thunderbird 38.2.0 on my PC because it continually is "not responding". Windows cannot resolve the problem. The problem code is AppHang B1. When I close the program and re-open it, I receive messages, but once it starts downloading messages in "important" it freezes up.

"Important" is an artifact of gmail, not a folder I created.

more options

mariannefitzgerald said

I can't use Thunderbird 38.2.0 on my PC because it continually is "not responding". Windows cannot resolve the problem. The problem code is AppHang B1. When I close the program and re-open it, I receive messages, but once it starts downloading messages in "important" it freezes up.

I went into Gmail settings and removed the importance markers and it solved the problem of Thunderbird getting hung up. I still don't understand why I had the issues after Monday's Thunderbird update (and not before) but at least it's working now.