This is truly bizarre.
If I open my English CHM, perform a search, open a topic, click the hyperlink to see the French version of that same topic, it opens correctly in the righthand pane. I can then click on the Contents tab to see my Table of Contents and do whatever else I want to do. It all works wonderfully.
If I open my French CHM, perform a search, open a topic, click the hyperlink to see the English version of that same topic, it opens correctly in the righthand pane BUT when I click on the Contents tab, the Search tab does not disappear. It actually stays in the foreground on top of my Contents tab Table of Contents. I tried flipping back to the Search tab and I no longer see my search criteria section - that's all gray - but I still see my search results. (Think overlapping divs to get a visual.)
Another variation is that I use only my Table of Contents, open a topic, click my language switch link and then go to the Search tab. The Search tab is completely gray - I see no inputbox for criteria and no empty search results pane.
I tried the same logical setup in two sample files with 2 topics in each but could not reproduce the problem.
I looked at the generation settings of both of my real CHM files and it all looks the same. I recompiled the French CHM and it still doesn't work.
Is there some strange thing I am missing?