Beside all the criticism against Tribe29 I also want to send an appeal to all customers and partners:
If you find a bug in checkmk its OK to apply a workaround to provide a quick fix, but please take the time and report such a bug to Tribe29 to give them a chance to fix it
After upgrade from 1.6 to 2.0 we ran in to a couple of issues even that we did an intense testing upfront. At least from one issue we know that other customers also had the same issue and just applied a workaround but never report back to Tribe29.
I know its some kind of work to collect all data for a ticket and help debugging but its worth for all of us to keep the software correct running and you probably will be paid back by other customers preventing you from wrong code.
I trust in Tribe29 that they handle such bug reports with the necessary care and do not also just provide a workaround 
best regards
Michael