Created attachment 126774 [details]
Small example for demonstration and with the current output result of the wizard

Steps to Reproduce:
1. Start LibreOffice
2. Overview Page is open
3. File -> Wizards -> Web Page...

Works partly (contrast to #99599)

Actual Results:
dependent of the underlaying OS there are different behaviors:

Tested with OSX 10.9.5 and Ubuntu 14.04:

Wizard Step 1 -> Intro = OK
Wizard Step 2 -> Add some .odt files to the web page content field = OK
Wizard Step 3 -> Select the main layout of the Web-Site = OK

But for Windows based OS there is no preview shown! If suddenly click in the grid - one of the preview flashes shortly to screen, then only a black frame is shown for additional clicks.

PROBLEM #1: This makes it impossible to select the right layout.

PROBLEM #2: Another problem pops up on step 5 (Format template): No preview for the symbol set!

PROBLEM #3: If the settings for the wizard is stored in "DefaultSession" and this is chosen at the next start - the office suite hangs infinite and must be killed by task manager.

PROBLEM #4: On Ubuntu and OSX - when the wizard works - all layouts based on a frame set are impossible to get completed. They are finished with a error dialog with title "LibreOffice 5.1.3.2" and the information "Error occurred during copy layout files".

If the user select a simple layout - it seems to work.
    
Tested with LibreOffice version 5.1.3.2 at OSX 10.9.5 (Mavericks)

See attachment for a sample to generate a web site by assistant.