[Wien] parallel LAPW2 crashes in second iteration

[wien2k]

I run WIEN2k on a Linux cluster.  My .machines file is:
granularity:1
1:n020:1
1:n019:1
1:n013:1
1:n012:1
lapw0:n020:1 n019:1 n013:1 n012:1

LAPW2 crashes in second iteration when run on 4 processors or more with 
the error message:
>   lapw2 -c  -p        (16:14:31) running LAPW2 in parallel mode
**  LAPW2 crashed!
0.250u 0.120s 0:28.02 1.3%      0+0k 0+0io 12547pf+0w

BUT IT DOES NOT CRASH WHEN RUN ON 2 PROCESSORS!

Did anyone have a similar problem?