[Rd] cpu usage stays at 100% (PR#8903)

[ifetzer at gmx.net]

Full_Name: Ingo Fetzer
Version: 2.3.0
OS: Win XP
Submission from: (NULL) (141.65.192.22)


I realised after working on the RGUI with R 2.3.0 on my laptop (Intel Pentium M
1.6 Ghz,512MB RAM) R raises my CPU usage to 100% constantly. Also when exiting
RGUI some R processes remain active in the system and CPU usage is still at
100%. 
When killing RGui processes in taskmanager manually, CPU usage goes down to
normal.