Would anyone having problems with Play Store apps like to try a little experiment? I'm running Hashcode's current full rom/kernel and I don't seem to be having this issue. Prior to this, I was running gederom 5/7 and even though gapps are included with this rom, I still flashed 0429 gapps.
When I flashed Hashcode's rom today, I just wiped cache/dalvik, installed the rom and all was good. So, how about just repeating what I did to see if that works. Flash gederom, flash gapps, see if you have proper Play Store apps access. If you do, just wipe cache/dalvik and reflash Hashcode's 5/10 full rom.
I realize this not scientific but it is a way of troubleshooting. Maybe gederom leaves something from its install, especially since I'm only wiping cache & dalvik. I've seen something like this before with CM9 on the Touchpad and even the Nook Color. Worth a try....nothing to lose, maybe something to gain.
Btw, I already had Chrome installed but I just uninstalled it and was able to reinstall again from Play Store with no problem. I did make a nandroid beforehand just in case. Also, I'm sure most of you know that changing DPI from 160 will cause Play Store issues, especially with Chrome.
EDIT: I'm just thinking of things that came up with CM9 on the TP & NC regarding Play Store. Check and make sure your date is correct in settings-date & time, sometimes a rom install will knock it out of whack.
Mike T
Tried it, and when I pulled up the Play Store in gedeROM, the apps which had given the option to either install, open, or uninstall were now showing as incompatible. So I tried to flash the 5/10 Hashcode ROM along with gapps, and those apps (Facebook, Facebook Messenger, Chase, etc.) were still showing as incompatible, and missing if you ran a search. One of my friends on here who had flashed the 5/10 ROM and restored his apps and data with Titanium Backup decided to look for Facebook in the Play Market, and it was showing as incompatible.
Modifying the build.prop file to match the Galaxy Nexus was unsuccessful. Same issue. I tried wiping the sdcard and flashing Hashcode's 4/28 ROM (which he has removed from xda for some reason) along with the 4/29 gapps package, and everything was in the Play Market. When I did another sdcard wipe, and installed the 5/10 ROM with the 4/29 gapps package, the apps were gone. I tried again to modify the build.prop file, but no luck.
So the conclusion is that something changed between the 4/28 and 5/10 Hashcode ROMs. It's not the build.prop file, but something possibly in the device tree that may have been changed, and is confusing the Play Market as to what sort of device it's attempting to recognize.