The same problem, but it is not obligatory reproducible in the described way. Today I launched GIMP several times before it started disappearing from taskbar — it started do this only in an hour.
It also seems to be not gimp-specific: I experienced this first with TopCoder java applet (javaws from icedtea-7-plugin).
P.S. Came here from a duplicate bug #999100. Thanks, Sebastien.
The same problem, but it is not obligatory reproducible in the described way. Today I launched GIMP several times before it started disappearing from taskbar — it started do this only in an hour.
It also seems to be not gimp-specific: I experienced this first with TopCoder java applet (javaws from icedtea-7-plugin).
P.S. Came here from a duplicate bug #999100. Thanks, Sebastien.