DTShl64.dll causing Palemoon web browser not to close successfully

for some reason DTShl64.dll is ending up inside the palemoon.exe process and possibly not allowing the process to close successfully.

any ideas how/why this is happening? (or how it can be fixed?)

screenshot of DTShl64.dll in palemoon.exe process
http://forum.palemoon.org/download/f...=474&mode=view

thread where this problem was discovered
Pale Moon forum • View topic - Palemoon instability since v19