New version of SWAT4 SBA was released (v1.80) .
This new version packs ability to set maximum simultaneous connections when searching for servers, it will lower the chance of stuck of the search progress bar.
Default setting is 100 connections, but for some it might work best with 30 or even 500 seems to work fine. It all depends on the OS settings and your router.
There is also the chance that the issue wont go away, there are servers that are not accessible or sending errors back, there is not much to do from my side about it.
Enjoy.
You can update using automatic update or by clicking here : 
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