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What I've been doing for years has suddenly stopped working, and I don't know what I did.

I cannot download maps that show up in both MapSource and Basecamp to my GPS60CSx with a 4Gb SD card. I get an error message saying, for example, that the file I'm trying to download (install) contains 2.8Mb, but only 3769.5Mb of storage is available, please select a smaller map. The numbers seem correct. If, on the gpsr, I go to Setup>File info, the currently installed maps take up 59.95Mb and 3709.5 Mb are free.

As recently as a week ago, I installed maps from Mapsource with no problems, but that was before I installed Windows 8. Could that possibly be the problem. Doesn't seem likely.

Any help would be greatly appreciated.

Here's what I do. I know here must be something simple I'm missing.
Using Mapwel 8.5, create mow file by merging shp files.
File>Properties: File name as today's date, Family set as 71
File>Export Accept default suggestion (Alphanumeric) to Garmin:My Maps

In MSTK, Select IMG. File name does not show.

Using MapEdit 1.0.7.0, create mp file by importing shp files and saving as mp file. Map Properties>cgpsMapper: Tre size 1500;RGN limit 127, Tre margin 0. Transparent w/o background: Properties>Header: ID 10112011; Displayable Name "My Name", all others default
Export to Garmin/cgpsmapper

Compiles using cgpsmapper version 0.99a

In MapsetToolkit 1.77, click Select IMG, navigate to folder in which he file created is located (confirmed using Windows Explorer).
   File is not visible, nor are any other img files I previously created and uploaded to MapSource. All files purchased from GISFileDeport are visible.

For completeness, I am using Windows 7 Pro, 64 bit for this.

None of the img files that I have made show up when I do a Select IMG File in MSTK. The commercial ones and those d/l'ed from GPSFileDepot show up, but none of mine, made using Mapedit. This is a new phenomenon. The last time I created a mapset using MSTK, last October, everything worked fine. I must have changed something, but what?