To be a bug someone more must can reproduced it.
Can you give us more info for reproduced your problem?
Some screen capture, your language, Windows and K-Meleon versions, K-Meleon Extensions installed and plugins used. K-Meleon configuration.
If when you reinstall it K-Meleon worked fine and now not work fine this must be because you changed something in K-Meleon configuration.
We need know your K-Meleon configuration (prefs.js file).
K-Meleon in Spanish