An QNX 6.2 (a.k.a Momentics) fix has silently showed up at http://www.qnx.com/developer/download/updates/.
This patch increase the maximum number of unions allowed on the package filesystem. This is commonly seen when too many packages are installed, as a result some files and directories disappear.
Also showed up on the site is the GNU bison update. There is no information as what's new in this bison or why it is only available for the SE and PE version.Here are the direct links:
Momentics NC Update
Momentics SE Update
Momentics PE Update
Again, this is just a quick fix. Official source says a major patch release (probably will be called 6.2.1) will be available later this year. If everything is on schedule, we should be able to see such releases every six months.