I have to agree with you horrible application when it comes to UI and the errors drive you crazy when you right click on an application (after you've uninstalled TugZip) and 5 (give or take) error messages pop up.
I have found a way to fix it! After seraching myself I came across this thread but earlier that day I installed Glary Utilites and I remembered seeing COntext Menu Manager. Dowload and install Glary Utilities and click Context Menu Manager in the Modules>Optimize & Improve once clicked scroll down to TzShell and Untick it then press close and all problems should be gone.
The version of Glary Utilites I used is here:
http://majorgeeks.com/Glary_Utilities_d5870.html
Cheers!


Please give Rep or thanks If this helped!