Hi Igor,
Please upgrade the PstRotator (to v6.73) or PstRotatorAz (to v4.93) program in order to work with the latest versions of the UcxLog (ver6.59).
In the PstRotator select UcxLog as Tracker and set Tracking to Mode.
Writing a callsign in UcxLog (window CALL) will pass it to PstRotator, wich will calculate the azimuth for this callsign (using cty.dat, call3.dat and VHF_USA.mdb files). Press "GO to DXCC" button to turn antenna on that direction.
Regarding your question, you can not have active the mouse in a window (UcxLog) and the keyboard in onother (PstRotator), in the same time. This is the Windows.... In order to use the arrows, you need to click on the PstRotator window.
73,
Codrut - YO3DMU