When generation completes, there is a log file. Obviously you are not seeing that. There is also a different log file at C:\Users\<user-name>\AppData\Local\Temp\RHTMP folder.. That said, it is intended for Adobe use so you may find it doesn't help.
Does removing the topic(s) then allow the project to generate?
Has the project generated OK before?
Is this a project just upgraded from a Classic version?
Typically in this situation the best solution is divide and conquer.
Zip up the project so you have a copy that cannot accidentally be opened and worked on. That gives you a copy that you can safely revert to later if needed. Save the zip file somewhere safe.
METHOD ONE
In the new UI the output is controlled by what is in the TOC so create two copies of your TOC and delete different halves of the content from each. One should work and one should fail.
Assuming one half only failed, create a copy of it and again delete different halves. By repeating that you should narrow things down to the topic(s) that are giving grief.
If both failed, you need to create smaller and smaller sections.
METHOD TWO
Create a new TOC and drag to it the first folder in the Contents panel.
Generate that and if it works, drag the next folder.
When generating fails, delete all other folders from the TOC and then create two copies of the TOC.
Delete different halves of the content from each.
Generate again and one should work and one should fail. Repeat until you track down the rogue topic(s).
Once you know which topics are causing the issue, then it's a case of looking at the code if you know how and/or removing chunks of the content until you find the problem. By removing I mean applying a condition tag and expression to exclude parts of the content.
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My site www.grainge.org includes many free Authoring and RoboHelp resources that may be of help.
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