Use wingrep to search through the templates folder structure and files for the curl-bg1.png brings up a couple of entries for code calling that.
The first is in templates>ja_teline_iv>css>typo.css around line 732. You will find the following code.
div.ja-typo-event-day div.box-left-wrap {
background: url(../images/curl-bg1.png) no-repeat right top;
position: absolute;
top: -5px;
left: 5px;
width: 80px;
}
It appears that is used by a different template so the images were not included (a guess). So if you remove the above code that should fix the problem.
We have the same sort of code in template-rtl.css
div.ja-typo-event-day div.box-left-wrap {
background: url(../images/rtl/curl-bg1.png) no-repeat left top;
left: auto;
right: 5px;
}
So try commenting that out too. It may be a leftover from a different template.