4.18.8 bug
 

Do not share sensitive file types or exe extensions are not working in 4.18.8.
Even if you have all your settings to share nothing those two options revert back and it basically cause you to share files you have downloaded while on limewire for that specific occasion. The files are shared until you log off or until you manually go up an change the setting again after every download.
I hope this bug gets fixed soon...

Are you sure it's not related to Share Finished Downloads immediately in options, or perhaps Partial file sharing option?

Re
 

Yes, those are disabled. also i forgot to include its the (pro) version 4.18.8