I'm also having some issues...
Like in the game i can't acces the retroarch config anymore.

Is the wiki updated?

The directory that is missing is as follows:
/opt/retropie/configs/all/retroarch-joypads/udev

Thanks!

I would recommend reinstalling RetroPie completely (save everything you need to avoid to much configuration after install).

When attempting to compile using Debian I was getting kernel panics and references to null pointers in memory. After trying a different SD Card, Cables, and power sources everything has only began to work once I've bought a new Pi.

I can only assume I've got a faulty unit?

Regardless I'm now able to run RetroPie on the exact same setup (with the Pi swapped out).

@Darksavior actually snes9x2005 is not rendering jurassic park right. SNES9x2010 is actually doing it right. That game uses a kind of a fake high res mode that renders a 640x240 image, but the snes sends out a 320x240 image. So on a CRT TV, every other line blurs together making a kind of a fake transparency. It was a trick used in a couple of game including kirbys dream land 3. The problem is that emulators don't output down to 320x240, and show the full 640x240 image with every other line as a vertical line where there is supposed to be a fake transparency. There is a shader that does the blend, but makes the games look blurry during the 320x240 parts (kirby changes back and forth based on the level) and is slow on a Pi. Snes9x 2005 just ignores it all together and just shows a 320x240 image with no transparency. Bsnes on the other hand (not on the Pi) can detect it and add the blend when needed.

@edmaul69 that worked perfect thanks for the help

@soonerdoc I tested sending buttons from the 360s directly and had the same results. I believe its an issue with rgbcommaner. no big deal if you don't mind errors but I do. I decided to go pc on this arcade build now. New os but new problems :). I'll checkin again but please contact me if you find a soultion.

@BuZz I want to disable it for the Nintendo 64 and SNES

@Shootersf I have only tried PiFBA briefly. I use lr-fbalpha as I use a Pi3. Does PiFBA have a config file that can be edited and saved? It may well stick if you go that route.

I will try adding games. I will also check out the wiki forum. Thanks.

I tried it on a 32-bit installation of ubuntu and I must say it runs okay. However I don't know if it is really Dolphin 5.0.
It says "Dolphin f94cd57".

@Capeman save states can be dangerous if there is a in game save. I've had it where the game thought I was using a different memory card and could no longer save to the main game because the memory card from the save state did not match the real one.
They are great if you're just trying to pass a part, but not as a save to come back to.

@backstander

I think I'll need to level up a few more times.

It's really more intimidating than it is difficult. After you've written a couple of commands and learn a few troubleshooting measures, it becomes as routine as anything else.

Now, finally I found another image from the retropie facebook grp... tried it and BAM, no more color problems!!! Wth?
Guess I need to compare the configs since this last one was pre-configured for crt.

Awesome! :) Who would have thought-.. Thanks all!

I am going to put it in a NES advantage, and the two player switch "might" be used for power ON/OFF instead.

@Mahlon If you are happy to just use the default es_systems.cfg file, ie alphabetical order and default names etc you should actually delete the version in /home/pi/.emulationstation. The system will treat this as a custom config file. If you add extra systems to the Pi not already in this config file they won't appear unless you add them manually as it looks here first for the systems to display. If this doesn't exist it defaults to the /etc/emulationstationversion.

solved it! I just rebuilt the filesystem in another SD card and now everything is working.
Probably I have corrupted the configuration moving manually the images of the megadrive.
Thanks guys

@DEWx

What would I need to do, to (re)install the xbox-controller using xboxdrv (while removing it first, incl. the other driver)

If you're talking about the Xpad driver, as long as you include --detach-kernel-driver in the xboxdrv launch command, the two drivers should be able to coexist without issue.

It's definitely not worth your time to start every game just to see if it works. It won't get you anywhere since many games start fine but then have issues later.

If you are finding that many games don't work then you may have the wrong ROM set, it needs to match with the version of MAME you are using.

Assuming you do have the the correct set, you can find the non-working games more easily by running searches using the ROMlister program. For example you can use it to search for Sega S-TV ROMs which will never work on Raspverry PI. Then you can make a batch file to delete those ROMS.