Play store device isn't compatible error all of a sudden

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http://forum.xda-developers.com – version 3.8.17 only 24 out of 63 of my installed apps are showing on "installed" list and when I looked at some apps on the "all" list, it shows the your device isnt compatible error. My phone : CM 9.1 reverted back to 240 dpi I've tried: cleared play store data, clear cache, dalvik cache, fixed permission. I was using dpi at 182.5 and the playstore had no problem updating and installing new apps. all of a sudden it just shows 24 apps and the rest are not compatible. I flashed siyah kernel yesterday and I thought it was what caused the problem. since then (HowTos)