Waa fixer, developed by Cell Ninja fixes media upload problems with android version of WhatsApp. As of now this app fixes only uploading photos problem. Video upload fix is coming soon and the developer has promised to release that app for free in BlackBerry World after initial rounds of testing in Beta Zone. Download the app now from BlackBerry BetaZone.
Without Waa fixer running in background:
With Waa fixer running in background: