Steps to reproduce the issue.

1. Create a new space called "TEST".
2. Create a new page with title "bla: test"
3. Create a child page for the new page.
4. Create a new page with pagetree macro and set the root page to "bla: test"

Expected behaviour

The pagetree should display correctly with one page.

Actual behaviour

It shows the error message:

The root page TEST:bla: test could not be found in space TEST. 

Root cause:

1. version 5.5 or earlier: the space after column is stripped by Pagetree macro when saving the page, as consequence the search is running against to a wrong title as it become "bla:test".
2. version 5.6 and later: the auto complete add the space key in the page title, which makes the page title become "TEST:bla: test".

Workaround solution:

Upgrade Confluence to the latest release 5.6.x, then remove the space key added before save the pagetree macro.