Issue with compass while timer is running in cartridge

[keenonkites]

In the lastest version I've found an issue regarding internal compass jumping from true values to completely faulty values and (eventually) back to correct values if there is a timer running in the background of the cartrdige.
Details and a testcartdridge for showing the issue can be found on:
https://groups.google.com/forum/#!topic/whereyougo/Vt6HD2c0Wws

It would be great if someone could have a look at this issue... thanks in advance.
Patrik

[Lineflyer]

Repository was relived here here.
A corresponding issue (see mention link above) has been created in that repository.