I've been using RH8 for about 6 months and during this time I've frequently used the 'View Selected Item' button to proofread topics before generating a manual. This week my previews have started to come up blank. It doesn't matter what Condition Build Tag Expression is set on the topic or which view I choose in the preview window, it remains blank. I've not noticed any other options or settings in RoboHelp itself, but I'm wondering if I'm still missing something.
Known problem. I have always found closing RH and reopening it fixes the problem, nothing else does though.
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You're right about restarting fixing it. The problem persisted for several days, despite RoboHelp being started each day, but today it's behaving itself and pretending nothing ever happened. Anyway, I've filed it as a bug.