There must be more to it than that.

Please switch on vmicro>compiler>verbose and also "show build properties" then click Build>clean then click Build.

Post the output as a .txt file here or email to info[at]visualmicro.com along with link to this post

Ah well done.

There is a bit of a story to that and yes you are kind of right. There are many older libs that were designed and correctly specified at time of writing (or testing). Setting the architecture= was the right thing to do. However life moves on and it turns out the same code still works for other architectures that the original author has not tested for.

Therefore recent builds of arduino and visual micro have continued to filter the visible library lists by architectures= however the build process should ignore it and fall back to using the library if only one copy is installed. This means that adding #includes manually should build okay but the menus will not list the library.

A further complication in Visual Micro has been resolved via another thread today with a fix for release over the next few days. In this case, visual micro failed to use the library if the internal platform name was not defined as lowercase (ie: we needed arduino instead ARDUINO, or stm32 instead of STM32. This wasn't relevant in your case but worth a mention.

Thanks for the update and yes the simple answer would be for lib authors to make the update. It's a problem!