You could check out the release notes for SP4 (it would have the notes for all of the 8.0 service packs) to see if anything relates to your problem. You should install either SP3 or SP4, though, as they contained fixes for many problems. The upgrade paths for SP3 and SP4 to 9.1 are different, though, so you may want to look at that before picking one. If you stay with the original 8.0 release, you need to accept the fact that there will be problems and the only way to get them fixed is to upgrade.
make sure that target field has everyone read/write and is editable. If that works,re- apply needed settings one by one. Ive seen rules not firing properly because of security, dispite that should be handled by the "system". This behaviour seems to change between service packs and releases.