I am affected by this on futures; at least /ES and /NQ charts everyday at 6PM on the dot.
My simple fix for these two charts is as followed:
On windows, hit "Ctrl+E" to bring up studies windows
Double click very first study "ADX"; but can be any one in the list. This adds the study, click "Apply"
Now remove the very same study click "X" near the study name.
Lastly click "Ok" closing the study window.
Everything chart wise is retained (unaltered) and the blinking stops. Fast procedure not to mess up my zoom aspects, etc... that I have going that very day.
It seems to have something to do with the new data that starts coming in at 6PM, like after MOC data is settled and one or more indicator's on the chart ability to process that "new" data thereafter, it needs something to trigger re-running strategies.
With very same strategies on a chart with just a stock ticker, this does not happen at 6PM, however if TOS is left running overnight, it will be blinking when pre-market data arrives.
So when you run many charts it is better to restart ToS instances every morning. Tech support will immediately tell you I see you haven't logged off since XXX day, and that you need to restart everyday. It ****s, but I never have issues of any sort since I started firing up the instances every day.
Just sharing this in hopes it helps someone out, as I have gotten a lot out of the thinkscript community.