Complaint about <img ... >

I am evidently subscribed to this email list, but have not paid much attention, the traffic being mostly outside my experience. Nevertheless, if anyone can tell me what the Validator is complaining about here, I'd appreciate it. Last week, and last year, this code validated without complaint, and it works as is. 
Line 158, Column 69: Bad value http:../Images/KS/Research.gif for attribute src on element img: Expected a slash ("/").

<a href="../_A/A00.shtml#14">
<img class="im" src="http:../Images/KS/Research.gif" alt="Research road-sign"></a>
with a red underline marking the >  that closes the <img tag.  Inserting a slash in all logical places (one at a time) returns the same error. 

The <head> of the file is:

<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>Some title</title>
<!--[if lt IE 9]>
<script src="dist/html5shiv.js"></script>
<link rel="stylesheet" type="text/css"

and Class .im in the CSS link is

.im {
margin-left   : -33px;
vertical-align : middle;
float             : left;

Basically, it puts a small Knuth road-sign icon in the left margin, calling attention of one kind or another to the body of the text. (Clicking on the icon calls the section of file "A00.shtml" on which the various icons are explained.)

I haven't found anything that says <img  has changed recently, so it looks like a change in the Validator. What am I missing?

Cheers, Ferren
(Dr) Ferren MacIntyre
1 ch. des Echarts
Campagne sur Aude
11260 France
+33 (0) 468 748870
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Received on Monday, 8 December 2014 20:51:19 UTC