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XY Data with longitude values outside the +/-180 range disappears when reprojected.
Most data in a geographic coordinate system has longitude values between -180 and +180 degrees. Occasionally, geographic data is stored with longitude ranges of -360 to zero or zero to 360.
This is a known issue. The code that handles XY data in ArcMap was not checking the LeftLongitude property. Longitude values that fall outside the +/-180 range were not being reprojected.
Geographic Coordinate systems are categorized into one of three types:
Longitute values ranging from -360 to 0
Longitude values ranging from -180 to +180
Longitude values ranging from 0 to +360
The type is included as the LeftLongitude property in the spatial reference.
This issue has been resolved in ArcGIS 8.1.2.
For earlier versions, convert the longitude values into the range of -180 to +180.