Tapatalk seems to be spitting it's dummy out a fair bit recently.
I'll spend a bit of time looking at it later on this morning, I've re-installed it but to no avail atm.
It was working fine on Friday (the last time I checked on here with my phone), when did it stop working for you folks?
I think the flashing back and forth between the picture and the thread is the hover preview function, if the browser thinks you've the cursor hovering over the title then it will show you the preview.
By tapping on the thread or elsewhere on the page the "cursor" moves and the preview stops.
Aegis