(From The Release Post)
*There certainly were a lot of bugs in beta 4, weren't there. I believe that things have stabalized a bit in RC1.
*I've released a raster effect compatible version at a proof of concept level. There is a speed increase over previous version, but it's still really not a playable speed. This is the limit.
(From The Readme)
RC1 What's Changed
-Fixed the file browser as there was a bug in displaying game names.
-Due to a timer processing bug there was a possibility that some games wouldn't run and this has been fixed.
-Fixed a bug where a portion of games were slower due to a scan line calculation mistake.
-Minor corrections of the game name list (zipname.dat).
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Known Bugs: A list of what is known as of right now.
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-spinmast's screen doesn't display.
Cause Unknown
-Unstable music tempo in crswords, and others.
-Sound effects in sonicwi2's demo, etc... play continuously.
This cannot be fixed with the implementation in the current state. I think it's unavoidable in order to gain speed and stable sound playback. If only the PSP processing speed was faster.