I'm using PCManFM 1.1.2 and on Tools -> "Find Files" values with a / can make troubles. Here is an example:
1. Go to /tmp.
2. On "File Name Patterns" write "/*" without the doublequotes.
3. The search result will now be "search://tmp?recursive=1&show_hidden=0&name=/*&name_ci=1".
4. On going now a directory up PCManFM thinks that the / in the attribute is a directory and will navigate to "search://tmp?recursive=1&show_hidden=0&name=/".
As we are on search:// the last ? in the string should be like a delimiter. All characters behind it should not be treated as any special operation (like thinking in this case we are in a subdirectory).