did anyone ever figure out how to go back to the old version?

Not sure if this helps

Uncaught Exception error appears when upgrading to Yahoo! Messenger for BlackBerry smartphones version 2.0
Doc ID : KB14630
Last Modified : 2007-10-29
Document Type : Support


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Environment

* BlackBerry® Device Software 4.1
* BlackBerry smartphone
* Yahoo!® Messenger for BlackBerry® smartphones 1.0 to 2.0
* SDR151505



Problem

When attempting to upgrade from Yahoo! Messenger for BlackBerry smartphones version 1.0 to version 2.0 on your BlackBerry smartphone, the following error appears:

Uncaught Exception. java.lang.error

As a result, you are unable to complete the upgrade process.


Resolution
This is a previously reported issue that has been escalated internally to our development team. No resolution time frame is currently available.

Workaround

If you have not attempted to upgrade to Yahoo! Messenger for BlackBerry smartphones version 2.0, delete version 1.0 from the BlackBerry Applications list before installing version 2.0. For instructions on how to remove applications on the BlackBerry smartphone, see KB10040.

If you have attempted to upgrade to Yahoo! Messenger for BlackBerry smartphones version 2.0, complete the following steps:

1. From the Home screen on the BlackBerry smartphone, click Option > Applications.
2. Display the menu and click Modules.
3. Highlight net_rim_yahoo_messenger.
4. Display the menu and click Delete.
5. Install Yahoo! Messenger for BlackBerry smartphones version 2.0 on your BlackBerry smartphone.

I got BB yahoo messanger working on my 7290 but I'm just wondering if it would infact charge me on my data plan or something.

I'm also facing the same problems. Isn't RIMs going to do anything about this?

Still no .ipd file with the new service book?

I have a BB 7250 on the Verizon network. I have used IM+ and Berryvine Messenger but found them to have unstable connections. I was excited to hear that you can now add MSN IM users to your Yahoo Contact list. It works well at home when I use Yahoo Messenger on my PC. When I tried to use Yahoo Messenger on my Blackberry to IM my MSN contacts, it didn't work.

I also tried the Verizon MSN Mobile software but you have to pay 15 cents PER message. Crazy. I wish Microsoft and Blackberry could get it together to make MSN messaging (Windows Live) work on the Blackberry.

I can IM MSN users from the BB Yahoo Messenger, but they can't IM me. I show up as online to them, but they don't show up as online to me. Has anyone had any success using Yahoo Messenger on your Blackberry to IM MSN contacts?

I had success with it for about 2 minutes when it first was released. Since then it hasn't worked and has acted exactly like you said in your post.

new version of YM is out, 2.0.43 .
Maybe it will solve some bugs,