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After updating from Virtualbox 5.1.12 to 5.1.14 some VMs can't see COM ports that I have enabled for them.
For example I typically use 2 windows 7 machine for kernel debugging over COM ports.
In my setup the machine which creates the pipe can see the COM port in Device Manager, however the debuggee which connects to the existing pipe cannot see the COM port in Device Manager.
I have tried disable and enabling the setting however the issue persists.
Downgrading from 5.1.14 to 5.1.12 solved this.
Is anybody else experiencing this issue and is there any known fix?
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Well after cloning a new windows 7 install I can use it fine.
Unfortunately I still don't know what is causing the existing VMs misbehave.
The best solution for now appears to just be to recreate whatever VMs are affected.
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