Redmine

The third bullet point should read:

- create a new wiki page, and then type

[[Tools_-_Online]]

In any case, you may want to make sure that there are no (incompatible) plugins messing with your links

No plugins on my installations at all.

Have just been able to reproduce this on a fresh 5.0.5 install from scratch. There's a little bit of change required in steps to encounter the bug. I'm pasting them below:

To reproduce:

- redmine setup to Markdown (OK)
- create a wiki page named "Tools_-_Online" (OK)
- create a new wiki page, and then type (3 consecutive links): [[Tools_-_Online]] [[Tools_-_Online]] [[Tools_-_Online]] (OK)
- save the page and verify that instead of having three separate links to Tools_-_Online, the wiki page displays Tools_-<u>Online Tools</u>-<u>Online Tools</u>-_Online which is coloured in red as it does not resolve to a valid link (s) (FAIL)

I can reproduce the issue in Redmine 5.0.4 using the CommonMark Markdown formatter. If you put this somewhere in the markdown, it the underscores are interpreted incorrectly as formatting:

[[Tools_-_Online]] [[Tools_-_Online]]

Or:

[[Tools_-_Online]]
[[Tools_-_Online]]

Workaround: Use spaces in wiki link instead of underscores (` ` instead of `_`) as the underscore represents a space anyway.

[[Tools - Online]]
[[Tools - Online]]