I know someone asked the same question 8 days ago, but I start a new topic even so.
I use Sketchup free fror years now and I’m used to the (maybe old?) keyboard shortcuts. I’m encountering these problems:
-When I enter dimensions (without first clicking in the window) I can write numbers but it is like the Enter key is inactive. I tried with . and , and ; (even copied the “mouse writing” like 50mm, 25mm) between the numbers but nothing works…
-the R (for squares) and C (for circles) shortcuts aren’t working either. Other shortcuts are working. But maybe I’m used to older versions…
Have you tried another browser? Most Web version users prefer Chrome.
Another possibility is a faulty keyboard (stuck alt or ctrl key, for instance) or Windows Sticky Keys.