I think Mark was playing with enums. If you don't mind submitting your test, we should add it to the codebase to prevent this regression in the future. At least it is fixed in HEAD and we should also check the fix was backported to 5.2.x branch.

2011/7/27 Wolfgang Laun <wolfgang.laun@gmail.com>

Given the following rule replicated for enums EDay.SUNDAY through EDay.THURSDAY and
a single DummyTester fact starting with EDay.SUNDAY.
rule "Sunday"
when
    $dt: DummyTester(EDay.SUNDAY == day)
then
    System.out.println("RULE: entered rule: "+drools.getRule().getName());
    modify ($dt) {setDay(EDay.MONDAY)};
end

On 5.1.1 and using HEAD:
RULE: entered rule: Sunday
RULE: entered rule: Monday
RULE: entered rule: Tuesday
RULE: entered rule: Wednsday
RULE: entered rule: Thursday

On 5.2
RULE: entered rule: Thursday
RULE: entered rule: Wednsday

Who knows how this was fixed?

Regards
-W

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