Agreed this is a real problem.,, Annoying that you had a problem with Nights in UltraISO, I'll give that a try here at some point and see if I can replicate. Might be worth reporting it to them. I've converted about 20 images with UltraISO so far and no issues.
Just tried PowerISO, that has the same problem, not creating a true virtual drive that CD/DVD imaging software can use.
Daemon Tools is just producing unusable images here 100% of the time and keeps causing the PC to freeze, I cannot recommend it.
Daemon Tools LITE works properly on my end, as far as converting images go. I mount, then make a .cdm in cd manipulator (multisession mode, subcode reading enabled), rename the cdm to ccd, and play. It never failed for me.
Also, remember that you need to make sure you do full subcode check to include the pregaps in the image. This may be why you can't get some applications to work, as they have alternate ripping modes for simpler formats and more powerful ones. CloneCD itself is capable of ripping with or without pregap information too.
Ultraiso may have worked for you because, like I mentioned, I tried an edge case - Nights has two data tracks and requires proper pregap information to work. Games that don't require that may work fine. Also, some games like Taito Chase HQ will also require proper subcodes as it have multiple track indexes, so I bet that one won't work on Ultraiso either.
PowerISO installer leads to a malware site on my end, same as all Alcohol installers, both for 52% and 120%.
If NRG files were supported in Rhea (they include subcodes iirc), then Nero could be a viable option, but last time I checked it wasn't free - plus, I've been using the same version of it for over 10 years (because it works flawless even on Windows 10), I have no idea what a modern version of Nero looks like or what it can/cannot do.
Just tried Daemon Tools Lite 10.07 on another PC with Windows 7.. same results, mount a perfectly working image file, run it through discjuggler, get a non working image. Discjugger is verified as working fine by making an image from an original CD no problem.
Zyrobs, are you using Daemon Tools in SCSI or DT mode?
The file crc will most likely change because different apps rip with different settings, plus Daemon may not handle things like pregaps the same way. Regardless, it should not affect whether the game works or not except for very rare edge cases (or PC Engine titles).