Oddly enough, I have had some issue with a GDI DLL at some point with ITMS. However, the solution I do believe, did not require any DLL modifications, but instead it was GPO related, or the site was missing from Trusted Sites.
Something I would try is to hit F12 on IE to get to Developer Tools. Once in Developer Tools, go to Emulation. Once in Emulation, change the Document mode to IE11 or Edge. I have seen GPO's force the document mode to a certain level if the DOCTYPE isn't declared in HTML (and it isn't in Altiris). This has presented itself as a problem now in multiple clients, after IE build 11.0.32 I believe it is.
Long story short, updating IE via Windows Update KB's, in combination with some clients use of GPO's, has been causing IE to render stuff incorrectly, due to the document mode being incorrect.