It's impossible to tell from that screen shot, we'd need the actual flights you've selected when it won't move forward at the end, city pair and airline are fine, don't need flight numbers.

BTW, are you aware you're paying over €2,000 more originating from BRU instead of OSL? Since you're not using any Europe segments, you can go OSL-DOH-ORD for your first leg for a lot more miles, but you can't ticket that on the tool, have to call AA or BA. To get AA to ticket you'd need your DFW-SYD AA coded which generally isn't difficult unless near a holiday. Then QF gets real stingy with D space.

Just looking at the basics you have there, assuming you want all of those cities, here's what I'd do:
OSL-xDOH-ORD (QR)
ORD-DFW (AA)
DFW-SYD (QF, AA code)
SYD-DRW (QF)
DRW-DPS (QF JQ?)
DPS-xKUL-SIN (MH) or DPS-xHKG-ICN (CX)
SIN-xHKG-ICN (CX) or SIN-xKUL-ICN (MH) or SIN-xHND-GMP (JL)
ICN-xDOH-BRU (QR)
BRU-xLHR-OSL or BRU-xHEL-OSL (can be throw away or the start of another RTW)

If you're trying to make it a DGLOB34 to get the non-stop Jetstar flight DPS-SIN, I personally wouldn't. The price difference between DGLOB34 and DONE4 is only about €70 ex-OSL and exactly the same ex-BRU. You can get a lot more tier points going on a DONE4 and using some of my suggested routings (basically don't use the KUL connections if you want max tier points, I suspect CX via HKG would net more on both to SIN and to SEL, but it also has higher taxes, not sure about CX's YQ compared to MH and JL, I think it's higher than JL but maybe similar to MH, you'd have to test it)

*EDIT: Ah ha, just noticed your GFL designation, you wouldn't care about maxing tier points in that case. So the OSL-xDOH-ORD may be unnecessary unless you just want to fly QR. OSL-xHEL-ORD likely results in lower YQ than OSL-xLHR-ORD