Well, if your .VDI file is less than 300 mb, than you can download the trial version of PowerIso and open the VDI file without Youwave being open, or copy the .VDI file to another folder (as a backup) and try to open that one with Power Iso. Supposedly it works with WinMount too, but I don't have WinMount so I wouldn't know.
Now, what I would do is:
Option 1 (if you can use PowerIso or WinMount):1.- Open Youwave; Then Whatsapp => Menu => Settings => Chat Preferences => Chat History Backup (Make a backup)
Whatsapp will create some encrypted databases in /sdcard/WhatsApp/Databases named "msgstore-<date>.db.crypt"
2.- Backup your Youwave ID.
3.- Close Youwave, open/mount the .VDI file with PowerIso or WinMount => copy ALL the WhatsApp encrypted Databases to your computer.
You might want to optionally copy the two files I mentioned in my previous post.
4.- Reinstall Youwave, or restore the original VDI file
5.- Restore your Youwave ID.
6.- Initiate the WhatsApp installation (but to not enter your phone number yet)
7.- If necessary, create the folders needed by WhatsApp (if they aren't created yet by the installer), and copy your backed up Encrypted Databases.
If you need to create the "WhatsApp" main folder, make sure it's named properly. I once named it "Whatsapp" instead of "WhatsApp", and the backup didn't work. Don't know if that was related, but it doesn't hurt to get things right the first time.

8.- Proceed with the installation of WhatsApp; if it doesn't restore your chat history, (progress bar of chat restore doesn't reach 100%), then it's most likely that the DB are malformed.
9.- (Optional) As a last resort, you could remove WhatsApp (AGAIN) and then also put the non-encrypted database files "msgstore.db" and "wa.db" in "/data/data/com.whatsapp/databases/" and try reinstalling WhatsApp. If the "databases" folder doesn't exist, just create it.
Option 2:I'm not sure if this would work, and I haven't tried it, but if you make a backup of your VDI file like I suggested at first, then there's not harm done in trying, I guess.
1.- In Youwave go to Home => Menu => Manage Apps => Dropbox => Clear Data AND Uninstall
You might want to optionally restart Youwave.
2.- Open Rootexplorer; Remove all traces of Dropbox. I think I found most of the files, which are:
/data/system/Dropbox
/data/local/tmp/dropbox.apk
/data/app/com.dropbox.android-2.apk
/data/data/com.dropbox.android
These are the only references to dropbox I have in my .VDI file. If you find anymore, delete them.
3.- Restart Youwave; then Reinstall Dropbox.
And hopefully it works!! Like I said, I didn't try this, but I'd imagine that if a program is closing down, it probably has damaged files/data (probably from shutting down/rebooting your computer without properly shutting down Youwave. I remember that with earlier versions of Youwave, the .VDI file and/or certain Apps would sometimes get corrupted if you didn't shut down Youwave and then give the computer a few minutes before shutting it down or rebooting. I don't know if this still happens with the new versions!
If none of these two options work, then we'll have to think of something else.