You don't have any log? And you are sure that it happens for all those commands? (since I didn't touch qdb from the original plugin that's really unexpected) Did you have network issues? Do you have an API key for vdm/fml?
Ok, I can reproduce tfln and qdb, but I'm sure that the issue with vdm/fml is the missing API key (you'll need to ask for the key and modify the source to add it). We very heavily use vdm/fml/mlia, so I'm pretty sure it's not broken ;)