Version: 0.5 (using KDE 4.5.3)
After saving your screenshot, it cannot open file because the temporary file has been removed.
Steps to Reproduce:
take a screenshot
click on open with : gimp
gimp is opening and return the message : "file doesn't exist"
it try to open the temp file which was removed by the saving process
application viewer open the last saved file
OS: Linux (i686) release 2.6.32-29-generic
*** This bug has been marked as a duplicate of bug 258431 ***