Polar form in CAS trouble, and questions new user

[clytle374]

New to prime and very rusty in maths, lost my HP48GX :crying:

My issue is this. Just playing around with the emulator, I found that (1∡90) or (1,∡90) or 1∡90 locks the linux emulator. 1∡89.999 and 90.001 doesn't lock it up, 180 does lock it up. Real calculator and android app handle it fine. Hoping that the linux version keeps getting updated. So I decided to start messing with CAS.

Actually here is the issue, I enter the following
LINE:
1:1∡90
RESULT: crazy but pretty correct number converted to rectangular form.
2: copied result to entry line, was transformed back to polar, but now in radians?
RESULT: rectangular form but interpreted as deg input?
3: repeat step 2/

In radians mode the result doesn't self mutate.

Thanks
Cory