B4J Question [ABMaterial] Problem with loading the page


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I wrote a simple webapp for a client, however, I have a rather strange problem with which I first met. The point is that a small percentage of people do not load the page. Stops on the loading animation. I turned off the gzip because I suspected that maybe it does affect but it did not help. To be sure, I have replaced all the css, font, js libraries, because maybe one of them was damaged when copying.
What else can I do to locate the error?

error loading.png