I haven't had problems. I usually need to click on a pop-up affirming that I'm interested in female providers.
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What happens to you? Do you get an error page or something?

Perhaps...

they were having site issues when you tried to access the site.
I use Tryst and log-in daily and had no issue.

and no issues so far to log in. my only issue is how the cities are displayed. I dont think is US (zip code-areas) wise.  
and you have to put available now ( to be on top of the listing- even when paying the higher listing)

I never had an issue using the site ever, since it's one of the very few places that I actively advertise on.