The problem is that the OBJ files contain n-gons, i.e. polygons with more than 3 or 4 vertices. The OBJ importer tries to triangulate them, but expects them to be triangle fans, which is usually not the case, when you have concave n-gons. I received a scene from Smicha, and the very first face (polygon) in the file is:
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f 1/1/1 2/2/1 3/3/1 4/4/1 5/5/1 6/6/1 7/7/1 8/8/1 9/9/1 10/10/1 11/11/1 12/12/1 13/13/1 14/14/1 15/15/1 16/16/1 17/17/1 18/18/1 19/19/1 20/20/1 21/21/1 22/22/1 23/23/1 24/24/1 25/25/1 26/26/1 27/27/1 28/28/1 29/29/1 30/30/1 31/31/1 32/32/1 33/33/1 34/34/1 35/35/1 36/36/1 37/37/1 38/38/1 39/39/1 40/40/1 41/41/1 42/42/1 43/43/1 44/44/1 45/45/1 46/46/1 47/47/1 48/48/1 49/49/1 50/50/1 51/51/1 52/52/1 53/53/1 54/54/1 55/55/1 56/56/1 57/57/1 58/58/1 59/59/1 60/60/1 61/61/1 62/62/1 63/63/1 64/64/1 65/65/1 66/66/1 67/67/1 68/68/1 69/69/1 70/70/1 71/71/1 72/72/1 73/73/1 74/74/1 75/75/1 76/76/1 77/77/1 78/78/1 79/79/1 80/80/1 81/81/1 82/82/1 83/83/1 84/84/1 85/85/1 86/86/1 87/87/1 88/88/1 89/89/1 90/90/1 91/91/1 92/92/1 93/93/1 94/94/1 95/95/1 96/96/1 97/97/1 98/98/1 99/99/1 100/100/1 101/101/1 102/102/1 103/103/1 104/104/1 105/105/1 106/106/1 107/107/1 108/108/1 109/109/1 110/110/1 111/111/1 112/112/1 113/113/1 114/114/1 115/115/1 116/116/1 117/117/1 118/118/1 119/119/1 120/120/1 121/121/1 122/122/1 123/123/1 124/124/1 125/125/1 126/126/1 127/127/1 128/128/1 129/129/1 130/130/1 131/131/1 132/132/1 133/133/1 134/134/1 135/135/1 136/136/1 137/137/1 138/138/1 139/139/1 140/140/1 141/141/1 142/142/1 143/143/1 144/144/1 145/145/1 146/146/1 147/147/1 148/148/1 149/149/1 150/150/1 151/151/1 152/152/1 153/153/1 154/154/1 155/155/1 156/156/1 157/157/1 158/158/1 159/159/1 160/160/1 161/161/1 162/162/1 163/163/1 164/164/1 165/165/1 166/166/1 167/167/1 168/168/1 169/169/1 170/170/1 171/171/1 172/172/1 173/173/1 174/174/1 175/175/1 176/176/1 177/177/1 178/178/1 179/179/1 180/180/1 181/181/1 182/182/1 183/183/1 184/184/1 185/185/1 186/186/1 187/187/1 188/188/1 189/189/1 190/190/1 191/191/1 192/192/1 193/193/1 194/194/1 195/195/1 196/196/1 197/197/1 198/198/1 199/199/1 200/200/1 201/201/1 202/202/1 203/203/1 204/204/1 205/205/1 206/206/1 207/207/1 208/208/1 209/209/1 210/210/1 211/211/1 212/212/1 213/213/1 214/214/1 215/215/1 216/216/1 217/217/1 218/218/1 219/219/1 220/220/1 221/221/1 222/222/1 223/223/1 224/224/1 225/225/1 226/226/1 227/227/1
That doesn't work currently in Octane. The exporter should split these n-gons into triangles or quadrangles.
Cheers,
Marcus