I like Snapz Pro X. I have been using it for several years, paying for updates along the way. I currently have 2.1.2.

Here's my reason for commenting:
At every start up (MacPro; OS 10.5) I get a window that tells me of the new version 2.1.3. Fine, except I cannot get it to stop. The options provided in the window are as follows:
A box to check :don't show this message again.
Then two buttons: Cancel, and Go To Website.
When I tick the "don't show again," my only next option is the Cancel button. This seems to cancel the fact that I checked the don't show again box because it just keeps showing up.
I don't know what to do with this and it is getting annoying enough for me to abandon Snapz Pro altogether.