New library checkbox in latest version ?

So i updated the emu with the latest version, "boot game" - and nothing is happening. Apparently there is a new checkbox in the settings menu "load required libraries", which is checked by default, and if it is checked the emu is telling me it cant find "libln10n.sprx" in the external dev_flash. I have a .prx one, but apparently that is not good enough ? If i uncheck the box the game loads as usual. I just dont get it. Either the devs overlooked that it is checked by default making the emu unusable "out of the box", or is my setup somehow wrong that i dont have that particular sprx but a prx instead ?

edit: okay, so installing the firmware fixed that. Soooo...do i actually NEED prx files for anything anymore ?
Also, is it my weak system, or does new version have problems with sound skipping ?

Installing firmware does it properly, the prx versions aren't needed, it only looks for sprx
There shouldn't be any sound skipping, depending on the game of course. What was the latest build it worked fine for you?

The one i have previous to one i downloaded today was "RPCS3 v0.0.1-3-684089b Pre-Alpha". Playing Super Robot Taisen Z3 - the sound is good, barely any hitching. Latest build skips once every 3-4 seconds. FPS is seemingly the same.

684089b is from December 2016, the time frame there is too big. Probably affected by memory reservations rewrite.