contacting the author directly. Here goes the write-up:
In version 0.9.7, the dropdown (combobox) widgets in the capture
dialogs don't work anymore. I mean, they _do_ drop down, but it is
not possible to change the selection. This happens both in the sample
rate setting and in the recording size setting.
I resurrected version 0.9.6, and things are normal there. I can
even set values for both (sample rate and recording size), and
they will then be read in 0.9.7 (but are unchangeable).
After focusing the combobox with a mouse click, it is possible to select
the sample rate (or capture size) with the keyboard. <enter> then
correctly selects the item.
I just noticed that the Color scheme selection combobox _does_
work with the mouse. Not entirely normally though: The dropdown
menu appears at the other end of the OLS window, completely
separate from where the actual Preferences dialog is (8 cm away).
Note: I'm using JRE 184.108.40.206 on Slackware Linux