Constant "cannot execute due to a network license limit" Errors.

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So, our BW install has been running without issue for years. Yesterday morning my users (5) started reporting "cannot execute due to a network license limit" errors. This is not a hung task or hung user issue as, once everyone has exited the client, no users or tasks are visible in either "dbregister or the "Network Status Report". In response I installed the most recent HF (which claimed to have mitigated this issue) but the problem persists. 2020 was initially installed in October. Anyone have any advice on this?