I have tested CWCheat by myself and in my opinion ARK plugin load function is OK, but the problem must be on prx or another possibility is in emulator limitation - it emulates PSP 1000 so it runs on 32 mb of ram.
So I've have proper plugin recomended for 6.60.
1. PRX - in this case I am not have time for messing with it - I do not know if it have source code released. So maybe developer of this plugin will improve it someday, but as i mentioned before in my opinion this problem is caused by emulator.
2. Database - I've get database with >1700 tittles - ~4 MB file - it is huge, even on PC it is loading slowly...
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Examples:
Assasin Creed EU version - cheats is visible...
Metal Slug Anthology EU version - cheats is not visible - even game name is not showing.
-> Even on CEF this didn't working <-
OK, so mainly I've figured how it should work, and also have good library of cheats.
So I've ripped of JP games, sports games (without Fight Night Round 3 off course - I am addicted to this games

) and demos from from database. So my database have 767 tittles (EU&US - without sport games like Fifa, NBA etc.) of 1714 all tittles from main database.
This is link to my database:
http://www.mediafire.com/?m6mt866x7uuvz0uDelete old one... Upload my db. Run your ISO - enter CWCheat menu. Find
[ 0] Reload Cheat Database and hit
X, then enable cheat engine (
Enable Cheats) change to
Y value. Now you can use
Select Cheats.
So another thing - good thing is that CWCheat could load many different databases. For instance cheat.db is known as
0 on
[ 0] Reload Cheat Database.
So I could make another database with codes that I've deleted from main ~4 mb database. Main database is known as cheat.db, so making cheat1.db we could for this moment fix issue wth none loading cheats. Database change is possible on
[ 0] Reload Cheat Database 0 - is cheat.db, change to
1 and fix X it could load cheat1.db.
Please inform me if the games upper than M is showing ok - EU&US versions.