Do you mean that only that single pattern appears or that several patterns appear but you can select only that one. I have just checked and don't have similar difficulties. I suggest you check your Lines_Def.txt file to ensure all the patterns you want to define on that texture are present.
Don
Yes, only the walkway pattern is available for selecting.
I checked the Lines_Def.txt file and all the patterns are listed as far as I can tell.
Here is my Lines_Def.txt file listing:
Hold-Short | gp_PatternedLines_40F | U=3 | 50 | 512
Apron Limit | gp_PatternedLines_40F | U=17 | 22 | 512
Single (Yellow) | gp_PatternedLines_40F | U=17 | 8 | 512
Single (White) | gp_PatternedLines_40F | U=275 | 8 | 512
Single (Red) | gp_PatternedLines_40F | U=432 | 8 | 512
Double (Yellow) | gp_PatternedLines_40F | U=64 | 20 | 512
Double (White) | gp_PatternedLines_40F | U=308 | 20 | 512
Double (Red) | gp_PatternedLines_40F | U=465 | 20 | 512
Dashed - Long (Yellow) | gp_PatternedLines_40F | U=45 | 8 | 512
Dashed - Long (White) | gp_PatternedLines_40F | U=289 | 8 | 512
Dashed - Long (Red) | gp_PatternedLines_40F | U=446 | 8 | 512
Dashed - Short (Yellow) | gp_PatternedLines_40F | U=92 | 8 | 512
Dashed - Short (White) | gp_PatternedLines_40F | U=340 | 8 | 512
Dashed - Short (Red) | gp_PatternedLines_40F | U=497 | 8 | 512
Walkway - White | gp_My_Patterns | V=945 | 73 | 1024
Walkway - Yellow | gp_My_Patterns | V=7 | 73 | 1024
Parking Single Row | gp_My_Patterns | V=944 | 75 | 1024
Parking Double Row | gp_My_Patterns | V=806 | 130 | 1024
Walkway | gp_Patterns | V=690 | 107 | 1024
Crosswalk | gp_My_Patterns | V=693 | 104 | 1024
Hold-Short | taxiway_marks | U=16 | 113 | 512
ILS Hold-Short | taxiway_marks | U=208 | 64 | 512
Single (Yellow) | taxiway_marks | U=16 | 18 | 512
Double (Yellow) | taxiway_marks | U=16 | 49 | 512
Dashed - Long (Yellow) | taxiway_marks | U=138 | 29 | 512
Dashed - Short (Yellow) | taxiway_marks | U=79 | 18 | 512
Thanks,
Alan