Android Marketplace Issues

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http://forums.androidcentral.com – Kindle is rooted. Running Apex Launcher. Marketplace was fully functional for me until a couple of days ago. The Marketplace has suddenly stopped working. I can browse just fine, but when I click to download an app, I get a "Marketplace has stopped working" popup, forcing me to close it. I have tried uninstalling the vending.apk and other files and reinstalling them, but to no avail. Any ideas? (HowTos)