The Latest MP update crashes my site??

A couple weeks ago I updated my WooThemes Canvas theme, BuddyPress, Mingle Forum, and several other plugins. I did this one by one and when it came to the Market Press plugin it gave me the white screen for the site. So I manually renamed the MP plugin file to deactivate it, and get my site back up. So currently not able to use the latest MP version update. Not updating to the latest versions always makes my host provider nervous as I've had some malware infections they say are related to hacking old versions of themes, plugins, etc.. What would be your suggestions for a fix? Thanks