So, I finally purchased Uplink for myself and have been playing it a lot
I've noticed that occasionally, the top most item in the activity thingy gets blacked out. This was happening frequently, and may be due to changing the CPU time allotments of the program, switching between windowed and full screen or a mixture of the two.
Also, since the two security hardware upgrades require physically space, maybe you should need to have that space available before it'll be installed? Unless the quirk of having the security, but no way of running it is intentional.