trendlines keep disappearing

whenever i draw trendlines on a chart, and then change the timeframe or close mt4 and reopen it the trendlines are gone.

when i draw them on the 5min for example, and go to 15min they are gone. if i go back to 5min they are still gone.

anyone have a clue why?

i have visualization set to "all"

sometimes it will randomly not happen for a while, like when i change timeframes and stuff they dont disppear.

i cant figure out why this is.

can anyone help meh?

Are you running any indicators or EAs? If so, remove them or start from a new clean chart.

Reboot your computer.

If you're experiencing weird behavior from other applications your CPU may be overheating.

As a last resort I'd uninstall and reinstall MT4.