11.   But other problems loom.

12.   But other publishers said a problem might be looming, and distributors are more blunt.

13.   But the problem looms larger.

14.   But two problems loom like jagged rocks in the river.

15.   Computer professionals have known for decades that the problem was looming.

16.   Despite the strides made by visually impaired users, big problems loom.

17.   Even so, problems loom.

18.   From the outset, however, one problem has loomed large.

19.   Insurance problems loomed for many residents.

20.   Nonetheless, problems loom for a number of American companies.