Glitch (bug?) in 2.3.6.1

[Rich Shepard]

I've encountered unusual behavior when compiling the document using
pdflatex. When I've used an ERT within a float figure's caption lyx
highlights the string containing that ERT and pops up an error box which
tells me only that there's an error.

Closing that error box and repeating the command, ctrl-x/ctrl-h, presents
the message that the pdf files's been created in the status bar.

In one figure caption I had '\mu' in an ERT box, in the other caption it is
'\textdegree' in the box.

Since I don't subscribe to the dev's mail list I'm posting this here. It
might be a bug, or the error message box and highlighting might be only a
distracting glitch.

Rich