I'll insert this again: There's a beta ongoing of a series of CEP2 betas. Until that series is completed satisfactorily, don't see new work to get put into the feeders. Maybe those reading this thread might want to get in touch [with the beta forum], and what the pulse is like.

I understand that there is a beta happening, but do we have any firm answer as to when we will have new WU's available? This being my primary project, it's kind of frustrating to not have received a single WU in about a month

I've just received a bunch of regular WUs (E236513/6/9 and E236520/2) on a Windows machine so it seems it's now back to normal. Some of them contains Selenium (like the most recent before the break) and some doesn't.

Unfortunately one of them errored out almost immediately (maybe because I'm running more than one at a time, which is inadvisable): (unknown error) - exit code 195 (0xc3). The other ones instead are running.

Don't pay much attention to the progress bar as it seems to move according to the average number of WUs processed and not % of WUs completed. As minimal WUs have come through in roughly a months time, it'll go back pretty far.

For the reason that CEP2 heavily impacts on thee HDD causing it to wear rapidly. Moreover cases of errors happeing during the elaboration have been reported when running more then 1 WU at a time.
There's an option in project preferences to control the number of simultaneous WU to run and is set to 1 by default for those reasons. Some people have found a work-around to those drawbacks in using RAM disk.