Hi,
I have investigated the issue further. You are right, once the pre cache is configured and called properly (cache sizes and specifying width AND height for max size option) the links to the cached images are displayed correctly.
However, one small ampersand-issue remains when applying printSearchForm(), which outputs the following line:
<input type="hidden" name="redirect" value="/index.php?userlog=1&album=bahnreisen%252Fxinjiang" />