Service Pack 2 issue?

System: BOXIr2 with SP1 and MHF1

I have previously installed CHF16 to get a fix for bug ADAPT00583193 (in CHF15). After the installation the problem went away as expected.
When I saw that SP2 was out I uninstalled CHF16 and installed SP2. Guess what? The bug is back! SP2 is supposed to include CHF13-16 and MHF1.

As I see it:

• there are a problem with SP2 and the above mentioned bug
• or there is an issue with those installations that had CHF16 installed before applying SP2.