Ok, I took a look at the SBL_grk font and the problem is that it's not been properly encoded. I recompiled the font and the modified version works fine in ADE, showing all the diacritics.
Unfortunately, the EULA for the font doesn't allow distribution of modified (i.e. fixed) versions :/. The problem lies with the font, not ADE, so you'll need to find one that's been properly compiled.
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