hmkay, nothing suspicious, and if you say you didn’t change anything in between “last week” and now (actually you didn’t answer that question)… I guess it’s some control under the hood which is messed up.
When the Talk button is not pressed, the only way to hear Mic1 in the main mix is --IIRC-- if [Microphone],master
is set to 1. Via GUI this is not possible with the officia skins, also it’s (should) be reset to 0 every time Mixxx starts. And it can only be toggled by a controller mapping or some custom skin (or some custom keyboard mapping).
If you like to find out if that’s he case you need to
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start Mixxx in developer mode
16. Appendix — Mixxx User Manual
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open Developer menu, Developer Tools action, Controls tab.
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paste [Microphone],master
into the search field at the top (this is for Mic1, for other mics use [Microphone2] etc.).
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check the value in the the third column