Following two user reports from the forums i tried to reproduces the crashing issues with Kleoptra mentioned in the Threads. I was able to reproduce the scenario described in this post, where a user stated, that Kleopatra crashes when he aborts the pinentry upon creating a fresh key.

Steps:

1. Open Kleopatra
2. Click in Menu-Bar "Create Key"
3. Enter options
4. Click "Next"
5. Click "Create"
6. As Pinentry pops up (or under), click "abort"
7. Crash of Kleopatra

Unfortunately I wasn't able do document the other crash issue with kleoptra, where it crashes even when you enter a passphrase in step 6 and it justs crashes. I was able to recreate it once, but the crash or the issue at all doesn't seem to be reproducable. My hope is, that the issues are somewhat related.