image capture is saving blank images from scanner

Hi, Ive been using image capture to scan some old printed photos from an Epson WF-7520 and after scanning quite few I noticed the last one was blank white. I checked back through the last 60 or so, and realized that quite a few were blank. It seems to be random, sometimes 2 or 3 in a row are blank, sometimes just 1. I tried to re-scan the last one, but it keeps coming out blank, despite looking OK in image capture. I have since tried re-scanning an earlier one and it won't scan either. mostly there are 2 or 3 photos on each page, and I scanned them all together ( image capture mostly detected, and selected & rotated them correctly). The image I've tried to re-scan several times i'm only selecting it to scan.

Some background:

I'm using a MacBookPro 9,1 running OS X.12.6 connected via Ethernet to my home network, The scanner is connected via wifi to the same network. I'm scanning to an external HD on a Mac mini running OSX 8.5 & Apple server.

A few months ago, I did a clean install of my Macbook pro to get rid of years of cruft ( I had been transferring from previous Macs for about 15 years). When I did that I only installed what I needed, ( and still worked) and didn't install the Epson software. I didn't seem necessary, everything work fine.

Things I've tried

I have restarted everything.

I installed the epson software that came on CD ( wouldn't actually install fully - too old?)

I downloaded latest software from epson and installed that. here http://tech.epson.com.au/downloads/product.asp

They included a file which was labelled EPSON Scan Common Updater, which sounded likely, but its a "DMS" file with no file suffix and I couldn't open it. Looked that up and it appears to be an Amiga disc image?

I ran the epson software updater from that site, the epson software still won't run, and image capture still produces blanks.

Any ideas?

How can I use a "DMS" file ( I tried adding .dmg to it to see if that worked - no luck)

Any other suggestions?

Thanks in advance

Graeme