Linux Boinc 4.43 unsuitable to run multiple projects

With "Leave applications in memory while preempted?" set to yes Boinc 4.43 is still mixing up projects. I now have the case of the einstein client sometimes not resuming, but staying inactive. When it is active CPU-time and Percentage is attributed to the suspended Seti-WU. The data of the Einstein-WU stay at 0. To make things worse: when Seti is resumed not the seti client always stays inactive, but the einstein-client ist started.
BOINC 4.43 on SuSE Linux 9.1. I have an einstein WU running and another ready to run with the same deadline. The second one will be late. I have also a seti WU with a later deadline (two weeks instead of one) paused. I read the following message, rather cryptical:
2005-06-01 16:24:18 [Einstein@Home] Pausing result H1_1130.5__1130.8_0.1_T18_Fin1_1 (removed from memory)
2005-06-01 16:24:24 [---] Computer is overcommitted
2005-06-01 16:24:24 [---] Nearly overcommitted.
2005-06-01 16:24:24 [---] New work fetch policy: no work fetch allowed.
2005-06-01 16:24:24 [---] New CPU scheduler policy: earliest deadline first.
2005-06-01 17:24:18 [---] schedule_cpus: time 3600.027180
2005-06-01 17:24:18 [---] earliest deadline: 1117978646.000000 H1_1130.5__1130.8_0.1_T18_Fin1_1
2005-06-01 17:24:18 [SETI@home] Pausing result 22ja05ab.1798.32576.522150.87_1 (removed from memory)