Browser problem. Don't know what browser, but check for updates. Clean your browser? Log out of forums, clear the cache, log back in. You can try clearing cookies too while clearing the cache, though all saved data will be gone, but still good to do sometimes. Though, you can clear specific cookies if you know how, which is usually what I do but takes time. Also check your plug-ins and extensions, make sure they are current and functioning. You can try disabling most/all to see if that helps, maybe not at the same time as clearing stuff out. If disabling works, turn them back all on and do a process of elimination hunt for the bad one.
Some suggestions.
Or quit using the red banana M$ browser
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