crazy behavior after Error (PR#10956)

Full_Name: Jan Somorcik
Version: 2.6.0
OS: Windows XP HOME
Submission from: (NULL) (158.195.31.33)


I used to run a simulation with 5000 iterations. For a long time everything was
OK, but since yesterday R stops after 500-1500 iterations [never at the same
position] with an [random?] Error message [always something else, e.g.:

Error in ans[[i]] <- tmp : incorrect number of arguments to "<-"

And after that R gets crazy:
Most of the commands result in an Error message, just an example:

  

d
    

[1] 3
  

d<-7
    

Error: could not find function "<-"
  

objects()
    

Error in objects() : 
  Value of SET_STRING_ELT() must be a 'CHARSXP' not a 'double'
  

sum(c(1,2,3))
    

Error: could not find function "sum"


It's always different. The most crazy situation was:
the result of an ARBITRARY command was a STRING containing the call of the
previuos command :-)))

What is the problem?
Is it an issue of Windows XP? It's beeing updated regularly and the on-line
scanners [Panda, Symantec, Kaspersky... did not report infection]
  

Other applications running:
-Total Commander
-notepad
-AVG Free antivirus

The behaviour is not reproducible, it is always different.