I had issues with flashing themed markets then I slowed down and read the post closely. If you already have the market u want to keep, read step 3 only.
1. If you've ran into issues flashing themed markets, flash the stock market (usually found in the fourm posts)
2. Then let the phone fully reboot. But do not launch market.
Then power cycle to recovery or in RM install zip. ... flash the themed Market. Let it reboot and it now should take. Launch to make sure.
3. If you're using an older market (I am using 2.2.11 transparent black blue... because u can scroll bottom list) , you can stop Market updateing to stock via OTA by going to system/app and rename marketupdater.apk to marketupdater.apk.bak.
Everytime I flashed after 45mins it updated to stock 2.3.2 and I hated it.
Now its finally staying. Hope this helps
Sent from my Droid using DroidForums App