Thanks Ziaul for trying.
I apologies for not responding directly. Mend a busy life right now.
I have downloaded the two files, and replaced the old ones. The feature box including a new or existing image is still failing. In fact, when I edited an existing page and corrected some text the website gave me the null display after save. When I hid the image of a question mark the webpage worked again.
Yes, template may be causing this and some override addon maybe needs to be changed, but which would that be?
I have compared the settings between the Educon and Helix standard template.
I found I have, at some point, entered a Custom CSS on the Educon template.
Not sure why but it reads:
#sp-page-builder .page-content .sppb-section { padding: 40px 0; }
#sp-page-builder .sppb-fullwidth-title {
color: #bd3a3a;}
#sp-page-builder .sppb-slidehsow-sub-title {
color: #bd3a3a;}
.entry-content table {
border: 1px solid #ededed;
border-collapse: collapse;
border-spacing: 0;
font-size: 14px;
line-height: 2;
margin: 0 0 20px;
width: 100%;
}
.entry-content table td {
border: 1px solid #ededed;
padding: 0.5em;
text-align: center;
}
.entry-content table tr:first-of-type td {
background: #68af26;
color: #fff;
font-weight: bold;
}
.entry-content table tr:nth-child(2) td {
background: #68af26;
border: none;
color: #fff;
font-weight: bold;
}
#offcanvas-toggler > i {font-size: 30px;}
Does this have anything to do with issues seen?
I tried applying Helix template to one page with error but in fact the error was also manifesting on that page even after purging the cache. Any clues where to look?? Thanks.