I'm wondering if anyone has run into this problem - I've seen it both with Ubuntu 9.0.4 Client and Solaris 10 U7 Client
(not tested it with Windows yet).
If you select some text in the Guest OS, and copy it to the clipboard, then paste that text into a
Thunderbird message you are composing, any text after the text you have pasted in will be lost
when you send the message. (This is highly annoying).
I've seen this with many previous releases of Virtual Box (2.x through to the current release 3.0.
running on both Mac OS X Leopard and Snow Leopard.
I've always ensured that the latest Guest Additions has been installed on the OS's and this issue
is highly repeatable.
I'm using Thunderbird 126.96.36.199
I only see this copy and paste issue when copying from the Guest Clipboard to the Host Thunderbird client.
(Nothing else seems to trigger this - copy and paste from other applications to Thunderbird works fine).
I'm quite happy to help try and debug this issue.