I also had the same problems with standard windows functions:
on PLD 184.108.40.2064
WIN 7 (64bit)
ora client 32(bit)
In fact, all "shortcut" keys were not in Preferences.
After "manual" configuration they did start working , including Fn.
While it's not a big deal, it is a bit an annoyance.
I've seen that problem for couple versions already.
Another tip: good ole' shift+insert works flawlessly for "paste".
(windows 3.11 anyone ;-)... )