Mapster32 - can't raise or lower sectors

[McMaster]

Hi,

maybe I'm really stupid but I just started Mapster (Snapshot 20080308b) and can't use the PGUP/PGDOWN keys for raising/lowering a sector.
Couldn't find anything on the web or in the forums. Could somebody help?

edit:
Wait a minute, my PGUP/PGDOWN keys don't work at all... wtf?

[Western Shinobi]

Restart your comp or get a new keyboard. Sorry.

[McMaster]

Life is mean.