[UPDATE] 12/11/12: We have discovered the issue, and have included a fix in the newest version of the app. Please download 5.5.8 in App World on your Blackberry. Thanks for your patience while we worked out a fix!
We have been receiving reports from BlackBerry users who have installed the latest version of Fousquare (5.5) that they are receiving the following error when attempting to check in "Invalid geo coordinates (0.000000,0.000000)"
We are currently investigating, and expect to have a resolution shortly!